Buttress attachment for surgical stapling instrument

ABSTRACT

A surgical stapling apparatus includes a handle, a tool assembly, and a staple cartridge. The handle includes an actuation trigger. The tool assembly is operatively coupled to the handle. In addition, the tool assembly includes a first jaw member and a second jaw member. The staple cartridge is releasably supported on the first jaw member. The staple cartridge includes first and second buttress materials and a spring member extending from the staple cartridge. The spring member is configured to support the second buttress material away from the first buttress material.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation application of U.S. patent application Ser. No. 15/181,888, filed Jun. 14, 2016, the disclosure of which is hereby incorporated by reference in its entirety.

BACKGROUND Technical Field

The present disclosure relates to attachment systems for staple line buttress materials, and more particularly, to systems and methods for detachably securing staple line buttress materials to a surgical stapling instrument.

Background of Related Art

Surgical stapling instruments are employed by surgeons to sequentially or simultaneously apply one or more rows of fasteners, e.g., staples or two-part fasteners, to body tissue for the purpose of joining segments of body tissue together. When stapling relatively thin or fragile tissues, it is important to effectively seal the staple line against air or fluid leakage. Additionally, it is often necessary to reinforce the staple line against the tissue to prevent tears in the tissue or pulling of the staples through the tissue. One method of preventing tears or pull through involves the placement of a biocompatible reinforcing material or “buttress” material, between the staple and the underlying tissue. In this method, a layer of buttress material is placed against the tissue and the tissue is stapled in the conventional manner.

Accordingly, new systems and methods that are reliable and that enable easy and efficient attachment and removal of a buttress material to the surgical stapling instruments would be desirable.

SUMMARY

The present disclosure describes attachment structures for securing a buttress material to a surgical stapler that demonstrate a practical approach to meeting the performance requirements and overcoming the usability challenges associated with buttress material attachment and removal. In general, the present disclosure describes a surgical stapler that includes a handle assembly, an elongate member extending from the handle assembly, and an end effector operatively coupled with the handle assembly.

In accordance with an embodiment of the present disclosure, there is provided a surgical stapling apparatus. The surgical stapling apparatus includes a handle, a tool assembly, and a staple cartridge. The handle includes an actuation trigger. The tool assembly is operatively coupled to the handle. The tool assembly includes a first jaw member and a second jaw member. The staple cartridge is releasably supported on the first jaw member. The staple cartridge includes first and second buttress materials and a spring member extending from the staple cartridge. The spring member is configured to support the second buttress material away from the first buttress material.

In an embodiment, the staple cartridge may include a contact surface configured to receive the first buttress material thereon. In particular, the spring member may extend from the contact surface of the staple cartridge. Furthermore, the spring member may be biased away from the contact surface.

In another embodiment, the spring member may be secured with the second buttress material along a length of the second buttress material.

In yet another embodiment, the first buttress material may be detachably secured with the staple cartridge. The first buttress material may be secured with the staple cartridge by at least one of a suture, a hook and loop fastener, adhesive, a cap, or a hook. The first buttress material may be detachably secured with the staple cartridge at proximal and distal ends of the first buttress material.

In yet another embodiment, the second buttress material may be configured to engage to the anvil.

In yet another embodiment, the second buttress material may be secured with the spring member by at least one of a suture, a hook and loop fastener, adhesive, a cap, or a hook.

In yet another embodiment, the spring member may extend along opposing sides of the second buttress material.

In accordance with another embodiment of the present disclosure, there is provided a reload for use with a surgical stapling apparatus. The reload includes a tool assembly, a staple cartridge, an anvil, and a buttress retention assembly. The tool assembly includes first and second jaw members. The staple cartridge is releasably supported on the first jaw member. The anvil is supported on the second jaw member. The buttress retention assembly includes first and second buttress materials and a spring member configured to support the second buttress material away from the first buttress material. The first buttress material is positionable on the staple cartridge. The spring member extends from the staple cartridge, wherein the second buttress material is biased toward the anvil when the staple cartridge is supported on the first jaw member.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate embodiments of the disclosure and, together with a general description of the disclosure given above, and the detailed description of the embodiment(s) given below, serve to explain the principles of the disclosure, wherein:

FIG. 1 is a perspective view of a surgical stapling instrument supporting a reload;

FIG. 2 is a perspective view of the reload of FIG. 1;

FIG. 3 is a perspective view of a tool assembly of the reload of FIG. 1, illustrating a staple cartridge separated from the tool assembly;

FIG. 4 is a side view of the staple cartridge of FIG. 3 and a buttress retention assembly mounted on the staple cartridge in accordance with an embodiment of the present disclosure;

FIG. 5 is a partial side view of the tool assembly of FIG. 3 including the buttress retention assembly of FIG. 4;

FIG. 6 is a bottom view of an anvil of the tool assembly of FIG. 3 including the buttress retention assembly of FIG. 4;

FIG. 7 is a partial cross-sectional view of a distal end of the tool assembly, illustrating tissue positioned between jaw members of the tool assembly;

FIG. 8 is a partial cross-sectional view of the distal end of the tool assembly of FIG. 7, illustrating actuation of the surgical stapling instrument;

FIG. 9 is a perspective view of a stapled and divided tissue section; and

FIG. 10 is a cross-sectional view of the stapled and divided tissue section as taken through 10-10 of FIG. 9.

DETAILED DESCRIPTION

Embodiments of the present disclosure are described in detail with reference to the drawings, in which like reference numerals designate identical or corresponding elements in each of the several views. As used herein, the term “distal” refers to that portion of a device that is farther from the user, while the term “proximal” refers to that portion of a device that is closer to the user.

With reference to FIG. 1, there is provided a surgical stapler 200 for use in stapling tissue and applying a layer of buttress material between staples and underlying tissue. Surgical stapler 200 generally includes a handle 202 and an elongate tubular member 204 extending distally from handle 202. Surgical stapler 200 further includes a retraction mechanism 217 that can be manually grasped and pulled proximally to retract a firing mechanism of surgical stapler 200. A reload 106 is removably coupled to a distal end 105 of elongate tubular member 204. Reload 106 includes a shaft portion 109 and a tool assembly 107 supported on shaft portion 109. Tool assembly 107 includes first and second jaw members 108, 110 which are movable between an open position for positioning tissue “T” (FIG. 7) between first and second jaw members 108, 110 and a closed position for clamping tissue “T” between first and second jaw members 108, 110 and subsequently stapling tissue “T”. First jaw member 108 releasably supports a staple cartridge 112, and second jaw member 110 supports an anvil 111.

With continued reference to FIG. 1, surgical stapler 200 includes a trigger 236 movably mounted on handle 202. Actuation of trigger 236 is configured to transition tool assembly 107 from the open position to the closed position and subsequently actuate surgical stapler 200 to apply lines of staples 178 (FIG. 10) to tissue “T”. In order to provide proper orientation of tool assembly 107 relative to tissue “T” to be stapled, surgical stapler 200 is additionally provided with a rotation knob 234 mounted on handle 202. Rotation of rotation knob 234 about a longitudinal axis “A-A” of surgical stapler 200 rotates tool assembly 107 about longitudinal axis “A-A.”

With reference to FIG. 2, a driver (not shown) is provided within reload 106 to move tool assembly 107 between the open and closed positions. The driver moves along a longitudinal slot 117 (FIG. 3) defined in staple cartridge 112. A knife blade (not shown) is associated with the driver to cut tissue “T” captured between anvil 111 and staple cartridge 112 as the driver passes through longitudinal slot 117 defined in staple cartridge 112. In order to secure staples 178 (FIG. 7) provided by staple cartridge 112 about tissue “T” and first and second buttress materials 302, 304 (FIG. 4), anvil 111 is provided with longitudinally arranged rows of staple clinching or forming pockets 44 (FIG. 7). Reference may be made to U.S. Patent Application Publication No. 2014/0263550, filed on Jan. 31, 2014, entitled “SURGICAL STAPLING APPARATUS,” the entire content of which is incorporated herein by reference, for a detailed discussion of the construction and operation of surgical stapler 200.

With reference to FIGS. 3 and 4, there is provided a buttress retention assembly 300 in accordance with an embodiment of the present disclosure. Staple cartridge 112 is detachably supported on first jaw member 108. Buttress retention assembly 300 is assembled with staple cartridge 112 prior to stapling of tissue “T”. Buttress retention assembly 300 includes first and second buttress material 302, 304 and a spring member 306. First and second buttress materials 302, 304 are configured to reinforce and seal staple lines applied to tissue “T” by surgical stapler 200. Spring member 306 may be, e.g., a coil spring, that provides a substantially flat profile when first and second jaw members are in the closed position. Under such a configuration, the effect of spring member 306 on staple formation is minimized.

With reference now to FIG. 5, first buttress material 302 is mounted on a contact surface 112 a of staple cartridge 112. In particular, first buttress material 302 may be secured with staple cartridge 112 by suture 310. Alternatively, first buttress material 302 may be detachably secured with staple cartridge 112 by, e.g., adhesive, hook and loop fastener, ultrasonic welding, hook, or a cap. First buttress material 302 may be detachably secured with staple cartridge 112 such that first buttress material 302 is detached from staple cartridge 112 by the stapling force. Alternatively, first buttress material 302 may be securely affixed to staple cartridge 112 such that first buttress material 302 remains securely affixed to staple cartridge 112 during staple formation.

Second buttress material 304 is supported by spring member 306 that extends from staple cartridge 112. Contact surface 112 a of staple cartridge 112 may include an anchor portion such as, e.g., a bore or a hook, to secure one end of spring member 306 thereto. Spring member 306 is biased away from staple cartridge 112 such that when staple cartridge 112 is placed within first jaw member 108, spring member 306 having second buttress material 304 mounted thereon is biased toward anvil 111. Under such a configuration, spring member 306 and second buttress material 304 together define a gap 305 with respect to staple cartridge 112 to receive tissue “T” therein.

With reference now to FIG. 6, spring member 306 extends along a length of second buttress material 304. In particular, peripheral portions 304 a of second buttress material 304 are supported by spring member 306 such that staple formation is unaffected. In addition, second buttress material 304 may be coupled to spring member 306 at, e.g., proximal and distal ends 306 a, 306 b of spring member 306. Second buttress material 304 may be coupled to spring member 306 by, e.g., a suture 310 or a cap 312 (FIG. 4). It is contemplated that spring member 306 may partially extend along the length of second buttress member 304. The length of spring member 306 may be tailored to provide sufficient biasing force to provide sufficient gap 305 between first and second buttress materials 302, 304.

It is further contemplated that second buttress material 304 may be secured with spring member 306 by, e.g., a hook and loop fastener, adhesive, ultrasonic welding, or hook. Second buttress material 304 may be detachably coupled with spring member 306 such that when tissue “T” is stapled, the stapling force disengages second buttress material 304 from spring member 306. However, it is also contemplated that second buttress material 304 may be securely affixed to spring member 306 such that the stapling force does not separate second buttress material 304 and spring member 306.

It is further contemplated that first and second buttress materials 302, 304 may be made from any biocompatible natural or synthetic material. The material from which the buttress material is formed may be bioabsorbable or non-bioabsorbable. It should of course be understood that any combination of natural, synthetic, bioabsorbable and non-bioabsorbable materials may be used to form the buttress material.

Some non-limiting examples of materials from which the buttress material may be made include but are not limited to poly(lactic acid), poly (glycolic acid), poly (hydroxybutyrate), poly (phosphazine), polyesters, polyethylene glycols, polyethylene oxides, polyacrylamides, polyhydroxyethylmethylacrylate, polyvinylpyrrolidone, polyvinyl alcohols, polyacrylic acid, polyacetate, polycaprolactone, polypropylene, aliphatic polyesters, glycerols, poly(amino acids), copoly (ether-esters), polyalkylene oxalates, polyamides, poly (iminocarbonates), polyalkylene oxalates, polyoxaesters, polyorthoesters, polyphosphazenes and copolymers, block copolymers, homopolymers, blends and combinations thereof.

In embodiments, natural biological polymers are used in forming the buttress material. Suitable natural biological polymers include, but are not limited to, collagen, gelatin, fibrin, fibrinogen, elastin, keratin, albumin, hydroxyethyl cellulose, cellulose, hydroxypropyl cellulose, carboxyethyl cellulose, chitan, chitosan, and combinations thereof. In addition, the natural biological polymers may be combined with any of the other polymeric materials described herein to produce the buttress material.

The buttress material may be porous or non-porous, or combinations of porous and non-porous layers. Where the buttress material is non-porous, buttress material may retard or prevent tissue ingrowth from surrounding tissues thereby acting as an adhesion barrier and preventing the formation of unwanted scar tissue. Thus, in embodiments, the buttress material possesses anti-adhesion properties. Techniques for forming non-porous layers from such materials are within the purview of those skilled in the art and include, for example, casting, molding and the like.

In embodiments, the buttress material is porous and possesses hemostatic properties. Where the buttress material is porous, it has openings or pores over at least a portion of a surface thereof. Suitable materials for forming the porous layer include, but are not limited to foams (e.g., open or closed cell foams). In embodiments, the pores may be in sufficient number and size so as to interconnect across the entire thickness of the porous layer. In other embodiments, the pores do not interconnect across the entire thickness of the porous layer. In yet other embodiments, the pores do not extend across the entire thickness of the porous layer, but rather are present at a portion of the surface thereof. In embodiments, the openings or pores are located on a portion of the surface of the porous layer, with other portions of the porous layer having a non-porous texture. Those skilled in the art reading the present disclosure will envision other pore distribution patterns and configurations for the porous layer.

Where the buttress material is porous, the pores may be formed using any method suitable to forming a foam or sponge including, but not limited to the lyophilization or freeze-drying of a composition. Suitable techniques for making foams are within the purview of those skilled in the art. Porous buttress materials can be at least 0.2 cm thick, in embodiments from about 0.3 to about 1.5 cm thick. Porous buttress materials can have a density of not more than about 75 mg/cm′ and, in embodiments below about 20 mg/cm². The size of the pores in the porous buttress materials can be from about 20 μm to about 300 in embodiments from about 100 μm to about 200 μm.

The buttress material may also include a reinforcement member. The reinforcement member may be associated with a porous or non-porous layer or may be positioned between a non-porous layer and a porous layer of the buttress material. Alternatively, the reinforcement member may be positioned entirely within one or more of the individual layers (i.e., embedded within the porous layer, the non-porous layer, or both) of the buttress material. It is also envisioned that the reinforcement member may be positioned at the surface of one of the layers making up the buttress material and, in embodiments, may be positioned at an exterior surface of the buttress material.

Some suitable non-limiting examples of reinforcement members include fabrics, meshes, monofilaments, multifilament braids, chopped fibers (sometimes referred to in the art as staple fibers) and combinations thereof. Where the reinforcement member is a mesh, it may be prepared using any technique known to those skilled in the art, such as knitting, weaving, tatting, knipling or the like. Where monofilaments or multifilament braids are used as the reinforcement member, the monofilaments or multifilament braids may be oriented in any desired manner. For example, the monofilaments or multifilament braids may be randomly positioned with respect to each other within the buttress material. As another example, the monofilaments or multifilament braids may be oriented in a common direction within the buttress material. Where chopped fibers are used as the reinforcement member, the chopped fibers may be oriented in any desired manner. For example, the chopped fibers may be randomly oriented or may be oriented in a common direction. The chopped fibers can thus form a non-woven material, such as a mat or a felt. The chopped fibers may be joined together (e.g., by heat fusing) or they may be unattached to each other. The chopped fibers may be of any suitable length. For example, the chopped may be from 0.1 mm to 100 mm in length, in embodiments, 0.4 mm to 50 mm in length. In an illustrative embodiment, the buttress material has randomly oriented chopped fibers that have not been previously fused together embedded within in the buttress material.

It is envisioned that the reinforcement member may be formed from any bioabsorbable, non-bioabsorbable, natural, or synthetic material previously described herein and combinations thereof. Where monofilaments or multifilament braids are used as the reinforcement member, any commercially available suture material may advantageously be employed as the reinforcement member.

In embodiments, at least one bioactive agent may be combined with the buttress material and/or any of the individual components (the porous layer, the non-porous layer and/or the reinforcement member) used to construct the buttress material. In these embodiments, the buttress material can also serve as a vehicle for delivery of the bioactive agent. The term “bioactive agent”, as used herein, is used in its broadest sense and includes any substance or mixture of substances that have clinical use. Consequently, bioactive agents may or may not have pharmacological activity per se, e.g., a dye, or fragrance. Alternatively a bioactive agent could be any agent which provides a therapeutic or prophylactic effect such as a compound that affects or participates in tissue growth, cell growth, or cell differentiation.

Examples of classes of bioactive agents which may be utilized in accordance with the present disclosure include anti-adhesives, antimicrobials, analgesics, antipyretics, anesthetics, antiepileptics, antihistamines, anti-inflammatories, cardiovascular drugs, diagnostic agents, sympathomimetics, cholinomimetics, antimuscarinics, antispasmodics, hormones, growth factors, muscle relaxants, adrenergic neuron blockers, antineoplastics, immunogenic agents, immunosuppressants, gastrointestinal drugs, diuretics, steroids, lipids, lipopolysaccharides, polysaccharides, and enzymes. It is also intended that combinations of bioactive agents may be used.

Anti-adhesive or anti-adhesion agents can be used to prevent adhesions from forming between the buttress material and the surrounding tissues opposite the target tissue. Some examples of these agents include, but are not limited to poly(vinyl pyrrolidone), carboxymethyl cellulose, hyaluronic acid, polyethylene oxide, poly vinyl alcohols and combinations thereof.

Suitable antimicrobial agents which may be included as a bioactive agent in the buttress material of the present disclosure include triclosan, also known as 2,4,4′-trichloro-2′-hydroxydiphenyl ether, chlorhexidine and its salts, including chlorhexidine acetate, chlorhexidine gluconate, chlorhexidine hydrochloride, and chlorhexidine sulfate, silver and its salts, including silver acetate, silver benzoate, silver carbonate, silver citrate, silver iodate, silver iodide, silver lactate, silver laurate, silver nitrate, silver oxide, silver palmitate, silver protein, and silver sulfadiazine, polymyxin, tetracycline, aminoglycosides, such as tobramycin and gentamicin, rifampicin, bacitracin, neomycin, chloramphenicol, miconazole, quinolones such as oxolinic acid, norfloxacin, nalidixic acid, pefloxacin, enoxacin and ciprofloxacin, penicillins such as oxacillin and pipracil, nonoxynol 9, fusidic acid, cephalosporins, and combinations thereof. In addition, antimicrobial proteins and peptides such as bovine lactoferrin and lactoferricin B may be included as a bioactive agent in the bioactive coating of the present disclosure.

Other bioactive agents which may be included as a bioactive agent in the buttress material in accordance with the present disclosure include: local anesthetics; non-steroidal antifertility agents; parasympathomimetic agents; psychotherapeutic agents; tranquilizers; decongestants; sedative hypnotics; steroids; sulfonamides; sympathomimetic agents; vaccines; vitamins; antimalarials; anti-migraine agents; anti-parkinson agents such as L-dopa; antispasmodics; anticholinergic agents (e.g. oxybutynin); antitussives; bronchodilators; cardiovascular agents such as coronary vasodilators and nitroglycerin; alkaloids; analgesics; narcotics such as codeine, dihydrocodeinone, meperidine, morphine and the like; non-narcotics such as salicylates, aspirin, acetaminophen, d-propoxyphene and the like; opioid receptor antagonists, such as naltrexone and naloxone; anti-cancer agents; anti-convulsants; anti-emetics; antihistamines; anti-inflammatory agents such as hormonal agents, hydrocortisone, prednisolone, prednisone, non-hormonal agents, allopurinol, indomethacin, phenylbutazone and the like; prostaglandins and cytotoxic drugs; estrogens; antibacterials; antibiotics; anti-fungals; anti-virals; anticoagulants; anticonvulsants; antidepressants; antihistamines; and immunological agents.

Other examples of suitable bioactive agents which may be included in the coating composition include viruses and cells, peptides, polypeptides and proteins, analogs, muteins, and active fragments thereof, such as immunoglobulins, antibodies, cytokines (e.g. lymphokines, monokines, chemokines), blood clotting factors, hemopoietic factors, interleukins (IL-2, IL-3, IL-4, IL-6), interferons (β-IFN, (α-IFN and γ-IFN), erythropoietin, nucleases, tumor necrosis factor, colony stimulating factors (e.g., GCSF, GM-CSF, MCSF), insulin, anti-tumor agents and tumor suppressors, blood proteins, gonadotropins (e.g., FSH, LH, CG, etc.), hormones and hormone analogs (e.g., growth hormone), vaccines (e.g., tumoral, bacterial and viral antigens); somatostatin; antigens; blood coagulation factors; growth factors (e.g., nerve growth factor, insulin-like growth factor); protein inhibitors, protein antagonists, and protein agonists; nucleic acids, such as antisense molecules, DNA and RNA; oligonucleotides; polynucleotides; and ribozymes.

In use, with reference back to FIGS. 3-5, buttress retention assembly 300 is assembled with staple cartridge 112. Thereafter, staple cartridge 112 is mounted in first jaw member 108 such that second buttress material 304 and spring member 306 are biased toward anvil 111. At this time, first and second buttress materials 302, 304 define gap 305 to receive tissue “T” therein. With reference now to FIGS. 7 and 8, tool assembly 107 is positioned adjacent tissue “T” to be stapled. At this time, the driver (not shown) is in a proximal position relative to longitudinal slot 117 of staple cartridge 112. Staple cartridge 112 includes staples 178 positioned within respective staple pockets 18. Staples 178 are of a conventional type and include a backspan 182 having a pair of legs 184 and 186 extending from backspan 182. Legs 184 and 186 terminate in tissue penetrating tips 188 and 190. Pushers 192 are located within respective staple pockets 18 and are positioned between staples 178 and the path of a drive bar 194.

With continued reference to FIGS. 7 and 8, surgical stapler 200 is initially actuated by movement of trigger 236 relative to handle 202 (FIG. 1) causing the driver to move in the direction of arrow “B” thereby transitioning tool assembly 107 to the closed position. At this time, drive bar 194 advances distally and urges pushers 192 upwardly against backspans 182 of staples 178, thereby driving staples 178 through first buttress material 302 mounted on contact surface 112 a of staple cartridge 112, tissue “T”, and second buttress material 304 mounted on anvil 111 and towards staple clinching pockets 44 in anvil 111. Tissue penetrating tips 188 and 190 are bent within staple clinching pockets 44 in anvil 111 to thereby secure second buttress material 304 mounted on anvil 111 against tissue “T” while backspan 182 secures first buttress material 302 mounted on staple cartridge 112 against tissue “T”.

With reference now to FIGS. 9 and 10, upon full actuation of surgical stapler 200, the knife blade (not shown) associated with surgical stapler 200 and carried by the driver cuts tissue “T”, as well as first and second buttress materials 302, 304 on opposing sides of tissue “T”, between the rows of now clinched staples 178. Upon movement of anvil 111 to the open position spaced apart from staple cartridge 112, first and second buttress materials 302, 304 pull away from respective anvil 111 and staple cartridge 112. The resulting tissue “T” is divided and stapled with staples 178. Specifically, first buttress material 302 that was mounted on staple cartridge 112 is secured against tissue “T” by backspans 182 of staples 178, and second buttress material 304 that was mounted on anvil 111 is secured against tissue “T” by the now clinched tissue penetrating tips 188 and 190 of staples 178. In this manner, first and second buttress materials 302, 304 are stapled to tissue “T” thereby sealing and reinforcing the staple lines created by staples 178.

Persons skilled in the art will understand that the structures and methods specifically described herein and shown in the accompanying figures are non-limiting exemplary embodiments, and that the description, disclosure, and figures should be construed merely as exemplary of particular embodiments. For example, spring member 306 may utilize other types of springs such as, e.g., a torsion spring, that is secured with a proximal end portion of second buttress material 304. It is to be understood, therefore, that the present disclosure is not limited to the precise embodiments described, and that various other changes and modifications may be effected by one skilled in the art without departing from the scope or spirit of the disclosure. Additionally, the elements and features shown or described in connection with certain embodiments may be combined with the elements and features of certain other embodiments without departing from the scope of the present disclosure, and that such modifications and variations are also included within the scope of the present disclosure. Accordingly, the subject matter of the present disclosure is not limited by what has been particularly shown and described. 

1. (canceled)
 2. A surgical stapling apparatus comprising: first and second jaw members; a staple cartridge releasably supported on the first jaw member; and a buttress retention assembly including: first and second buttress materials; and a spring including opposing arms laterally spaced apart, the opposing arms supporting the second buttress material, wherein the first buttress material is detachably secured with the staple cartridge, and the spring extends from the staple cartridge such that the second buttress material is biased away from the first buttress material.
 3. The surgical stapling apparatus according to claim 2, wherein a portion of the spring is interposed between the first and second buttress materials.
 4. The surgical stapling apparatus according to claim 2, wherein the spring is secured with the second buttress material along a length of the second buttress material.
 5. The surgical stapling apparatus according to claim 2, wherein the second buttress material is configured to engage an anvil supported on the second jaw member.
 6. The surgical stapling apparatus according to claim 2, wherein the staple cartridge includes a contact surface configured to receive the first buttress material thereon.
 7. The surgical stapling apparatus according to claim 6, wherein the spring extends from the contact surface of the staple cartridge.
 8. The surgical stapling apparatus according to claim 6, wherein the spring biases the second buttress material away from the contact surface.
 9. The surgical stapling apparatus according to claim 2, wherein the first buttress material is secured with the staple cartridge by at least one of a suture, a hook and loop fastener, adhesive, a cap, or a hook.
 10. The surgical stapling apparatus according to claim 2, wherein the first buttress material is detachably secured with the staple cartridge at proximal and distal ends of the first buttress material.
 11. The surgical stapling apparatus according to claim 2, wherein the second buttress material is secured with the spring by at least one of a suture, a hook and loop fastener, adhesive, a cap, or a hook.
 12. A surgical stapling apparatus comprising: a tool assembly including first and second jaw members; a staple cartridge releasably supported on the first jaw member; an anvil supported on the second jaw member; and a buttress retention assembly including: first and second buttress materials, the first buttress material positionable on the staple cartridge; and a spring including opposing arms supporting the second buttress material, the second buttress material being biased towards the anvil by the spring when the staple cartridge is supported on the first jaw member, the second buttress material and the spring extending from the staple cartridge.
 13. The surgical stapling apparatus according to claim 12, wherein the first and second buttress materials are releasably secured with the staple cartridge and the spring, respectively.
 14. The surgical stapling apparatus according to claim 12, wherein the opposing arms of the spring are spaced apart and extend along a length of the second buttress material.
 15. The surgical stapling apparatus according to claim 13, wherein the staple cartridge includes a contact surface configured to receive the first buttress material thereon.
 16. The surgical stapling apparatus according to claim 15, wherein the spring extends from the contact surface.
 17. The surgical stapling apparatus according to claim 13, wherein the staple cartridge and the first and second buttress materials are discrete components.
 18. The surgical stapling apparatus according to claim 13, wherein the second buttress material is exposed between the opposing arms. 